The goal of rFIA is to increase the accessibility and use of the United States Forest Services USFS Forest Inventory and Analysis FIA Database by providing a user-friendly open source toolkit to easily query and analyze FIA Data. Designed to accommodate a wide range of potential user objectives rFIA simplifies the estimation of forest variables from the FIA Database and allows all R users experts and newcomers alike to unlock the flexibility inherent to the Enhanced FIA design. Specifically rFIA improves accessibility to the spatial-temporal estimation capacity of the FIA Database by producing space-time indexed summaries of forest variables within user-defined population boundaries. Direct integration with other popular R packages e.g. dplyr tidyr and sf facilitates efficient space-time query and data summary and supports common data representations and API design. The package implements design-based estimation procedures outlined by Bechtold Patterson 2005 doi10.2737SRS-GTR-80 and has been validated against estimates and sampling errors produced by FIA EVALIDator. Current development is focused on the implementation of spatially-enabled model-assisted estimators to improve population change and ratio estimates.